JPH0419463B2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to a refrigeration system, and in particular, to a refrigeration system that uses brine as a heat medium for cooling and maintains at least two refrigeration chambers at different temperature settings using one refrigerator. Concerning new improvements for.

b. Prior Art Various configurations have been adopted and proposed for this type of refrigeration device that has been used in the past.
Among them, the representative composition is JP-A-55-
There are configurations shown in Publication No. 68567 and Publication of Utility Model Application No. 53-80866.

FIG. 4 is a cooling system diagram used in the above-mentioned conventional apparatus, etc. In the figure, what is indicated by the reference numeral 1 is a cooling brine tank. connected to,
A cooler 3 is provided for guiding the refrigerant.

The refrigeration section 2 is composed of a compressor 4, a condenser 5, a fan motor 6, and a capillary reach tube 7, and the refrigerant compressed by the compressor 4 passes through the condenser 5 and the capillary reach tube 7 and is cooled. is supplied to vessel 3.

In this cooling brine tank 1, brine 8, which is a heat medium for cooling, is accommodated, and a brine temperature control section 9 for controlling the temperature of this brine 8 to a predetermined temperature is provided.

A circulation pump 11 is installed in the suction pipe 10 provided at the bottom 1a of the cooling brine tank 1, and first and second electromagnetic valves 13 and 14 are connected to the outlet pipe 12 of the circulation pump 11. has been done.

A first heat exchanger 15 is connected to the first electric valve 13, and an outlet pipe 16 of the first heat exchanger 15 is connected to a return pipe 17 connected to the cooling brine tank 1. There is. Further, a second heat exchanger 18 is connected to the second electromagnetic valve 14, and an outlet pipe 19 of the second heat exchanger 18 is connected to the second solenoid valve 14.
It is connected to the return pipe 17 mentioned above.

Note that the first and second heat exchangers 15 and 18 described above
are arranged in a refrigerating room (not shown), and the internal temperature in each of these refrigerating rooms is controlled by the solenoid valves 13 and 1 by an internal temperature control section (not shown).
This is done by controlling the opening and closing of 4.

The conventional refrigeration device is configured as described above, and its operation will be explained below.

First, the refrigerant is supplied to the cooler 3 by the operation of the freezing section 2, and the brine 8 in the cooling brine tank 1 is cooled by heat exchange with the cooler 3. The temperature of this brine 8 is controlled to a predetermined temperature setting value by controlling the operation of the compressor 4 of the refrigeration section 2 by a brine temperature control section 9.

As mentioned above, the brine 8 in the cooling brine tank 1 whose temperature is controlled to a predetermined set value is passed through the electromagnetic valves 13 and 14 by the circulation pump 11, and then into the heat exchangers 15 and 18. supplied in circulation,
Again, it passes through the return pipe 17 to the cooling brine tank 1.
Go back inside.

As described above, by continuously circulating and supplying the brine 8, each of the aforementioned refrigerating compartments (not shown) is cooled by heat exchange with the heat exchangers 15 and 18.

The temperature of the brine 8 is controlled by the brine temperature control section which is set to be approximately 3° C. lower than the internal temperature control section (not shown) of the refrigerator compartment which is set lower in one of the above-mentioned respective refrigerator compartments. 9 controls the operation of the compressor 4 of the refrigeration section 2.

Further, the internal temperature control of each of the refrigerator compartments (not shown) is achieved by controlling the opening and closing of each electromagnetic valve 13 and 14 by an internal temperature control section (not shown). , when each of the electromagnetic valves 13 and 14 is turned off, the circulation pump 11 stops its operation.

c Problems to be Solved by the Invention Since the conventional refrigeration system is configured as described above, for example, when the internal temperature of each refrigerator compartment is set to almost the same temperature setting value, the above-mentioned problem occurs. Even when brine at the same temperature is used in one cooling brine tank, almost no problem occurs, but a problem occurs when the internal temperature settings of each refrigerator compartment are different.

In other words, if one refrigerator compartment is set to -3°C and the other refrigerator compartment is set to +2°C, the first solenoid valve 13 in the refrigerator internal temperature control section of one refrigerator compartment is set to -3°C.
The brine temperature controller 9 controls the temperature of the brine 8 to be -6°C at this time.

In the above case, the internal temperature is approximately + the brine temperature.
It has been confirmed from experimental results that it is possible to cool the refrigerator down to 3°C, and as a result, one of the refrigerators can be controlled at the temperature setting value -3°C.

However, in the other refrigerator compartment, the temperature setting value is +2°C, so the internal temperature control unit controls the second solenoid valve 14 to turn off at +2°C and turn on at +2.5°C, but in this case, Since the brine temperature has decreased to -6℃, it is attracted by this brine temperature to 0℃~
The temperature will drop to around -1℃, and +2℃ to +2.5℃.
It becomes impossible to maintain constant temperature, and as a result, the temperature ranges from -1 to +
The temperature range becomes 2.5℃, and the temperature difference becomes extremely large.

Therefore, originally, the brine circulation type refrigeration system was
This is because constant temperature is required, but in the case of two-room control, only one room can be controlled normally, but the other room cannot be controlled, and it is not possible to control the two rooms to different temperature states. It was difficult.

The present invention promptly solves the above problems and
It is an object of the present invention to provide a refrigeration device that can control each refrigeration compartment at various temperature setting values.

d Means for Solving the Problems The refrigeration system according to the present invention has a first brine cooling chamber and a second brine cooling chamber constituting a cooling brine tank.
a brine cooling chamber; a cooler provided in the first brine cooling chamber and connected to the freezing section; and a first cooling chamber for merging the brine in the first brine cooling chamber and the brine in the second brine cooling chamber.
The brine tank is equipped with a circulation pump, and the brine in each brine tank is cooled to different temperatures by the cooler.

e Effect In the refrigeration system according to the present invention, each of the brine cooling compartments is independently connected to each of the refrigerating compartments. Each temperature can be independently controlled to any set value without being influenced by temperature.

f Embodiments Hereinafter, preferred embodiments of the refrigeration apparatus according to the present invention will be described in detail with reference to the drawings.

Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.

Figures 1 to 3 are for showing the refrigeration system according to the present invention, with Figure 1 being a cooling system diagram and Figure 2 being a cooling system diagram.
The figure and FIG. 3 show the overall structure.

First, before explaining the configuration of the cooling system, the overall structure of the refrigeration system according to the present invention will be explained using FIGS. 2 and 3.

In FIGS. 2 and 3, the reference numeral 20 indicates a main body case filled with a heat insulating material and having an almost box-like shape as a whole. , multiple door bodies 2
2 is provided so that it can be opened and closed freely.

Inside this main body case 20, a first refrigerating compartment 24 and a second refrigerating compartment 25 formed by a partition wall 23 are provided.
A cooling duct 26 is provided on the back side of each of the refrigerator compartments 24 and 25.

A first heat exchanger 15 and a second heat exchanger are installed on the cooling duct 26 in each of the refrigerator compartments 24 and 25.
A heat exchanger 18 is provided, each of these heat exchangers 1
5 and 18 are provided with an internal fan 27, and the internal fan 27 circulates cold air from each heat exchanger 15 and 18 into each refrigerator compartment 24 and 25.

A drain plate 28 is disposed between the cooling duct 26 and each of the heat exchangers 15 and 18, and a drain pipe 30 is connected to the rear end 29 of each drain plate 28, and the drain pipe 30 is connected to the rear end 29 of each drain plate 28. It is discharged to the outside from the lower end 31 of the case 20.

In addition, a first internal temperature control section 32 and a second internal temperature control section 33 are provided in each of the refrigerator compartments 24 and 25, and control the drive of a circulation pump, which will be described later.
This configuration controls the internal temperature of each of the refrigerator compartments 24 and 25.

Next, a cooling unit 34 is placed on the top plate 20a of the main body case 20, and this cooling unit 34 is constituted by a cooling system as shown in FIG.

In the cooling unit 34, the reference numeral 1 indicates a cooling brine tank, and this cooling brine tank 1 has a first brine cooling chamber 1b and a second brine cooling chamber separated by a partition wall 35. It consists of 1c.

In the first brine cooling chamber 1b, a freezing section 2 is provided.
A cooler 3 is provided for connecting to and guiding the refrigerant.

The refrigeration section 2 is composed of a compressor 4, a condenser 6, a fan motor 6, and a capillary reach tube 7, and the refrigerant compressed by the compressor 4 passes through the condenser 5 and the capillary reach tube 7 to be cooled. is supplied to vessel 3.

In each of the brine cooling chambers 1b and 1c, a brine 8, which is a heat medium for cooling, is accommodated, and a first brine temperature control section 9a and a second brine temperature control section 9a and a second brine temperature control section 9a are used to control the temperature of the brine 8 to a predetermined temperature. A brine temperature control section 9b is provided.

The brine temperature control section 9a controls the compressor 4.
By controlling the drive of the brine 8 in the first brine cooling chamber 1b, the temperature of the brine 8 in the first brine cooling chamber 1b is maintained at a predetermined temperature set value, and the brine temperature control section 9b controls the drive of the first circulation pump 36, which will be described later. Thereby, the temperature of the brine 8 in the second brine cooling chamber 1c is maintained at a predetermined temperature setting value.

A first circulation pump 36 is provided in the suction pipe 10 provided at the bottom 1bA of the first brine cooling chamber 1b, and this circulation pump 36 is connected to an outlet pipe 37. Therefore, the first brine cooling chamber 1b
The brine 8 inside is supplied into the second brine cooling chamber 1c by the first circulation pump 36, and the brine 8 overflowing from the second brine cooling chamber 1c is returned to the first brine cooling chamber 1b and circulated. Therefore, the brine 8 in the second brine cooling chamber 1b is cooled by the brine 8 in the first brine cooling chamber 1b.

Further, the second circulation pump 11a connected to the first brine tank 1b is connected to the first heat exchanger 15.
The brine 8 is connected to the first return pipe 38 through the brine cooling chamber 1b, and only the brine 8 in the first brine cooling chamber 1b is circulated and supplied to the first heat exchanger 15. Furthermore, the brine 8 in the first brine cooling chamber 1b is controlled by a first brine temperature control section 9a that is set to be 3° C. lower than the set value of the first internal temperature control section 32 in the first refrigerator compartment 24. Therefore, by controlling the compressor 4, the temperature is controlled to a predetermined temperature.

Further, the first internal temperature control section 32 controls the second internal temperature control section 32.
By controlling the circulation pump 11a, the inside of the first refrigerator compartment 24 is controlled to a predetermined constant temperature state.

On the other hand, the third circulation pump 11b connected to the second brine cooling chamber 1c is connected to the second return pipe 39 via the second heat exchanger 18, so that only the brine 8 in the second brine cooling chamber 1c is It is circulated and supplied to this second heat exchanger 18.

Furthermore, the brine 8 in the second brine cooling chamber 1c is transferred to a second brine temperature control section 9b that is set to be 3° C. lower than the set value of the second internal temperature control section 33 in the second refrigerator compartment 25. Therefore, by controlling the first circulation pump 36, the temperature is controlled to a predetermined temperature.

Further, the second internal temperature control section 33 controls the third internal temperature control section 33.
By controlling the circulation pump 11b, the inside of the second refrigerator compartment 25 is controlled to a predetermined constant temperature state.

The refrigeration device according to the present invention is configured as described above, and its operation will be described below.

First, the first refrigerator compartment 24 is heated to -3°C, and the second refrigerator compartment 2 is heated to -3°C.
When the internal temperature control units 32 and 33 are set so that the internal temperature is +3°C, the refrigerant is supplied to the cooler 3 by the operation of the freezing unit 2, and the cooling brine is supplied by heat exchange with the cooler 3. The brine 8 in the first brine cooling chamber 1b of the tank 1 is cooled.

Brine 8 in this first brine cooling chamber 1b
is sent into the second brine cooling chamber 1c by the operation of the first circulation pump 36, and the brine 8 overflowing in the second brine cooling chamber 1c climbs over the partition wall 35 and flows into the first brine cooling chamber 1b. The brine 8 in the second brine cooling chamber 1c is cooled.

Next, the brine 8 in the first brine cooling chamber 1b
The temperature is maintained at a predetermined temperature by controlling the compressor 4 by the first brine temperature control section 9a, which is set 3° C. lower than the set value of the first internal temperature control section 32 in the first refrigerator compartment 24. controlled. Further, the brine 8 in the second brine cooling chamber 1c is controlled by a second brine temperature control section 9 that is set to be 3° C. lower than the set value of the second internal temperature control section 33 in the second refrigerator compartment 25.
By controlling the first circulation pump 36 according to b, the temperature is controlled to a predetermined temperature higher than the temperature of the brine 8 in the first brine cooling chamber 1b.

Therefore, the inside of the first refrigerator compartment 24 is
The second circulation pump 11 is controlled by the internal temperature control section 32.
By controlling a, the temperature is controlled to a predetermined constant temperature state via the first heat exchanger 15. On the other hand, inside the second refrigerator compartment 25 described above, the second refrigerator internal temperature control section 3
By controlling the third circulation pump 11b by the third circulation pump 11b, the third circulation pump 11b is controlled to a predetermined constant temperature state which is higher than that of the first refrigerating compartment 24 through the second heat exchanger 18.

In other words, when the above-mentioned first refrigerator compartment 24 is controlled at around -3°C, which is suitable for maintaining the freshness of meat, etc., the second
When the refrigerator compartment 25 is controlled at around 3°C, which is suitable for maintaining the freshness of vegetables, etc., in one refrigerator, 1
The two compressors can maintain two refrigerator compartments with different temperatures at ideal constant temperature and high humidity conditions.

In addition, although the above-mentioned cooling brine tank 1 has been described as having an integral structure in which the brine cooling chambers 1b and 1c are partitioned by the partition wall 35, it is not limited to the above-mentioned embodiment, and may have a separate structure. It goes without saying that similar effects can be obtained in the case of Furthermore, although the number of refrigerating compartments is two, it goes without saying that the configuration may include two or more refrigerating compartments.

g Effects of the Invention Since the refrigeration device according to the present invention is configured as described above, a plurality of refrigeration compartments can be controlled to different temperatures using one compressor.

In addition, each heat exchanger installed in each refrigerator compartment is independently connected to each brine cooling compartment with a different temperature, so the internal temperature will not be stretched to the brine temperature. It is possible to obtain a multi-chamber refrigeration system that can be controlled with a stable arbitrary temperature setting value and has excellent constant temperature.

[Brief explanation of drawings]

Figures 1 to 3 are for showing the refrigeration system according to the present invention. Figure 1 is a cooling system diagram showing the cooling system, Figure 2 is a front sectional view showing the overall configuration, and Figure 3 is a cooling system diagram showing the cooling system. FIG. 2 is a side sectional view, and FIG. 4 is a cooling system diagram showing a conventional refrigerator. 1 is a brine tank for cooling, 1b is a first brine cooling chamber, 1c is a second brine cooling chamber, 2 is a freezing section, 3 is a cooler, 4 is a compressor, 8 is brine, 9
a is the first brine temperature control section, 9b is the second brine temperature control section, 11a is the second circulation pump, 11b
1 is a third circulation pump, 15 is a first heat exchanger, 18 is a second heat exchanger, 24 is a first refrigerating compartment, 25 is a second refrigerating compartment, 32 is a first internal temperature control unit, and 33 is a second The internal temperature control section 36 is a first circulation pump.

Claims (1)

[Scope of Claims] 1. Cooling brine 8, which is a heat medium housed in a cooling brine tank 1, and circulating the brine 8 to at least two heat exchangers 15 and 18 by circulation pumps 11a and 11b. In the refrigeration system, the cooling brine tank 1 is configured to cool at least two refrigerator compartments 24 and 25.
a first brine cooling chamber 1b and a second brine cooling chamber 1c, a cooler 3 provided in the first brine cooling chamber 1b and connected to the freezing section 2, and the first brine cooling chamber 1c. a first circulation pump 36 for circulating the brine 8 in the first brine cooling chamber 1b and the brine 8 in the second brine cooling chamber 1c; A refrigeration device characterized in that brine 8 in 1c is cooled. 2. A second circulation pump 11a and a first heat exchanger 15 connected to the first brine cooling chamber 1b, and a third circulation pump 11b and a second heat exchanger 18 connected to the second brine cooling chamber 1c. A patent characterized in that the first heat exchanger 15 is disposed in one of the refrigerating compartments 24, and the second heat exchanger 18 is disposed in the other refrigerating compartment 25. A refrigeration device according to claim 1. 3. A patent characterized in that the second brine cooling chamber 1c has a brine temperature control section 9b, and the first circulation pump 36 is controlled by the brine temperature control section 9b. A refrigeration device according to claim 1 or 2. 4 It has indoor temperature control units 32 and 33 for controlling the indoor temperature of the refrigerator compartments 24 and 25, and the temperature setting values of the brine temperature control units 9a and 9b are as follows:
4. The refrigerating device according to claim 3, wherein the temperature is set lower than the temperature setting values of the indoor temperature control units 32 and 33 by a predetermined temperature.